content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * -----------------
   * XYSeriesTest.java
   * -----------------
   * (C) Copyright 2003-2013, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 23-Dec-2003 : Version 1 (DG);
   * 15-Jan-2007 : Added tests for new toArray() method (DG);
   * 30-Jan-2007 : Fixed some code that won't compile with Java 1.4 (DG);
   * 31-Oct-2007 : New hashCode() test (DG);
   * 01-May-2008 : Added testAddOrUpdate3() (DG);
   * 24-Nov-2008 : Added testBug1955483() (DG);
   * 06-Mar-2009 : Added tests for cached bounds values (DG);
   *
   */
  
  package org.jfree.data.xy;
  
  import org.jfree.chart.TestUtilities;
  import org.jfree.data.general.SeriesException;
  import org.junit.Test;
  
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotSame;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.assertTrue;
  import static org.junit.Assert.fail;
  
  /**
   * Tests for the {@link XYSeries} class.
   */
  public class XYSeriesTest {
  
      /**
       * Confirm that the equals method can distinguish all the required fields.
       */
      @Test
      public void testEquals() {
          XYSeries s1 = new XYSeries("Series");
          s1.add(1.0, 1.1);
          XYSeries s2 = new XYSeries("Series");
          s2.add(1.0, 1.1);
          assertEquals(s1, s2);
          assertEquals(s2, s1);
  
          s1.setKey("Series X");
          assertFalse(s1.equals(s2));
          s2.setKey("Series X");
          assertEquals(s1, s2);
  
          s1.add(2.0, 2.2);
          assertFalse(s1.equals(s2));
          s2.add(2.0, 2.2);
          assertEquals(s1, s2);
      }
  
      /**
       * Some simple checks for the hashCode() method.
       */
      @Test
      public void testHashCode() {
          XYSeries s1 = new XYSeries("Test");
          XYSeries s2 = new XYSeries("Test");
          assertEquals(s1, s2);
          assertEquals(s1.hashCode(), s2.hashCode());
  
          s1.add(1.0, 500.0);
          s2.add(1.0, 500.0);
          assertEquals(s1, s2);
          assertEquals(s1.hashCode(), s2.hashCode());
  
          s1.add(2.0, null);
          s2.add(2.0, null);
          assertEquals(s1, s2);
          assertEquals(s1.hashCode(), s2.hashCode());
  
          s1.add(5.0, 111.0);
          s2.add(5.0, 111.0);
          assertEquals(s1, s2);
          assertEquals(s1.hashCode(), s2.hashCode());
  
          s1.add(9.0, 1.0);
          s2.add(9.0, 1.0);
          assertEquals(s1, s2);
          assertEquals(s1.hashCode(), s2.hashCode());
      }
  
      /**
       * Confirm that cloning works.
       */
      @Test
      public void testCloning() throws CloneNotSupportedException {
          XYSeries s1 = new XYSeries("Series");
          s1.add(1.0, 1.1);
          XYSeries s2 = (XYSeries) s1.clone();
          assertNotSame(s1, s2);
          assertSame(s1.getClass(), s2.getClass());
          assertEquals(s1, s2);
      }
  
      /**
       * Another test of the clone() method.
       */
      @Test
      public void testCloning2() throws CloneNotSupportedException {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 100.0);
          s1.add(2.0, null);
          s1.add(3.0, 200.0);
          XYSeries s2 = (XYSeries) s1.clone();
  
          assertEquals(s1, s2);
  
          // check independence
          s2.add(4.0, 300.0);
          assertFalse(s1.equals(s2));
          s1.add(4.0, 300.0);
          assertEquals(s1, s2);
      }
  
      /**
       * Another test of the clone() method.
       */
      @Test
      public void testCloning3() throws CloneNotSupportedException {
          XYSeries s1 = new XYSeries("S1");
          XYSeries s2 = (XYSeries) s1.clone();
  
          assertEquals(s1, s2);
  
          // check independence
          s2.add(4.0, 300.0);
          assertFalse(s1.equals(s2));
          s1.add(4.0, 300.0);
          assertEquals(s1, s2);
      }
  
      /**
       * Serialize an instance, restore it, and check for equality.
       */
      @Test
      public void testSerialization() {
          XYSeries s1 = new XYSeries("Series");
          s1.add(1.0, 1.1);
          XYSeries s2 = (XYSeries) TestUtilities.serialised(s1);
          assertEquals(s1, s2);
      }
  
      /**
       * Simple test for the indexOf() method.
       */
      @Test
      public void testIndexOf() {
          XYSeries s1 = new XYSeries("Series 1");
          s1.add(1.0, 1.0);
          s1.add(2.0, 2.0);
          s1.add(3.0, 3.0);
          assertEquals(0, s1.indexOf(1.0));
          assertEquals(1, s1.indexOf(2.0));
          assertEquals(2, s1.indexOf(3.0));
          assertEquals(-4, s1.indexOf(99.9));
      }
  
      /**
       * A check for the indexOf() method for an unsorted series.
       */
      @Test
      public void testIndexOf2() {
          XYSeries s1 = new XYSeries("Series 1", false, true);
          s1.add(1.0, 1.0);
          s1.add(3.0, 3.0);
          s1.add(2.0, 2.0);
          assertEquals(0, s1.indexOf(1.0));
          assertEquals(1, s1.indexOf(3.0));
          assertEquals(2, s1.indexOf(2.0));
      }
  
      /**
       * A check for the indexOf(Number) method when the series has duplicate
       * x-values.
       */
      @Test
      public void testIndexOf3() {
          XYSeries s1 = new XYSeries("Series 1");
          s1.add(1.0, 1.0);
          s1.add(2.0, 2.0);
          s1.add(2.0, 3.0);
          assertEquals(0, s1.indexOf(1.0));
          assertEquals(1, s1.indexOf(2.0));
      }
  
      /**
       * Simple test for the remove() method.
       */
      @Test
      public void testRemove() {
          XYSeries s1 = new XYSeries("Series 1");
          s1.add(1.0, 1.0);
          s1.add(2.0, 2.0);
          s1.add(3.0, 3.0);
          assertEquals(3, s1.getItemCount());
  
          s1.remove(2.0);
          assertEquals(3.0, s1.getX(1));
  
          s1.remove(0);
          assertEquals(3.0, s1.getX(0));
      }
  
      /**
       * Some checks for the remove(int) method.
       */
      @Test
      public void testRemove2() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
          s1.add(4.0, 4.4);
          s1.add(5.0, 5.5);
          s1.add(6.0, 6.6);
          assertEquals(6, s1.getItemCount());
          assertEquals(1.0, s1.getMinX(), EPSILON);
          assertEquals(6.0, s1.getMaxX(), EPSILON);
          assertEquals(1.1, s1.getMinY(), EPSILON);
          assertEquals(6.6, s1.getMaxY(), EPSILON);
  
          s1.remove(5);
          assertEquals(5, s1.getItemCount());
          assertEquals(1.0, s1.getMinX(), EPSILON);
          assertEquals(5.0, s1.getMaxX(), EPSILON);
          assertEquals(1.1, s1.getMinY(), EPSILON);
          assertEquals(5.5, s1.getMaxY(), EPSILON);
      }
  
      private static final double EPSILON = 0.0000000001;
  
      /**
       * When items are added with duplicate x-values, we expect them to remain
       * in the order they were added.
       */
      @Test
      public void testAdditionOfDuplicateXValues() {
          XYSeries s1 = new XYSeries("Series 1");
          s1.add(1.0, 1.0);
          s1.add(2.0, 2.0);
          s1.add(2.0, 3.0);
          s1.add(2.0, 4.0);
          s1.add(3.0, 5.0);
          assertEquals(1.0, s1.getY(0).doubleValue(), EPSILON);
          assertEquals(2.0, s1.getY(1).doubleValue(), EPSILON);
          assertEquals(3.0, s1.getY(2).doubleValue(), EPSILON);
          assertEquals(4.0, s1.getY(3).doubleValue(), EPSILON);
          assertEquals(5.0, s1.getY(4).doubleValue(), EPSILON);
      }
  
      /**
       * Some checks for the update(Number, Number) method.
       */
      @Test
      public void testUpdate() {
          XYSeries series = new XYSeries("S1");
          series.add(new Integer(1), new Integer(2));
          assertEquals(2, series.getY(0));
          series.update(1, 3);
          assertEquals(3, series.getY(0));
          try {
              series.update(2, 99);
              fail("SeriesException should have been thrown for unknown key");
          }
          catch (SeriesException e) {
              assertEquals("No observation for x = 2", e.getMessage());
          }
      }
  
      /**
       * Some checks for the update() method for an unsorted series.
       */
      @Test
      public void testUpdate2() {
         XYSeries series = new XYSeries("Series", false, true);
         series.add(5.0, 55.0);
         series.add(4.0, 44.0);
         series.add(6.0, 66.0);
         series.update(4.0, 99.0);
         assertEquals(99.0, series.getY(1));
      }
  
      /**
       * Some checks for the addOrUpdate() method.
       */
      @Test
      public void testAddOrUpdate() {
          XYSeries series = new XYSeries("S1", true, false);
          XYDataItem old = series.addOrUpdate(new Long(1), new Long(2));
          assertNull(old);
          assertEquals(1, series.getItemCount());
          assertEquals((long) 2, series.getY(0));
  
          old = series.addOrUpdate(new Long(2), new Long(3));
          assertNull(old);
          assertEquals(2, series.getItemCount());
          assertEquals((long) 3, series.getY(1));
  
          old = series.addOrUpdate(new Long(1), new Long(99));
          assertEquals(new XYDataItem(new Long(1), new Long(2)), old);
          assertEquals(2, series.getItemCount());
          assertEquals((long) 99, series.getY(0));
          assertEquals((long) 3, series.getY(1));
      }
  
      /**
       * Some checks for the addOrUpdate() method for an UNSORTED series.
       */
      @Test
      public void testAddOrUpdate2() {
          XYSeries series = new XYSeries("Series", false, false);
          series.add(5.0, 5.5);
          series.add(6.0, 6.6);
          series.add(3.0, 3.3);
          series.add(4.0, 4.4);
          series.add(2.0, 2.2);
          series.add(1.0, 1.1);
          series.addOrUpdate(new Double(3.0), new Double(33.3));
          series.addOrUpdate(new Double(2.0), new Double(22.2));
          assertEquals(33.3, series.getY(2).doubleValue(), EPSILON);
          assertEquals(22.2, series.getY(4).doubleValue(), EPSILON);
      }
  
      /**
       * Another test for the addOrUpdate() method.
       */
      @Test
      public void testAddOrUpdate3() {
          XYSeries series = new XYSeries("Series", false, true);
          series.addOrUpdate(1.0, 1.0);
          series.addOrUpdate(1.0, 2.0);
          series.addOrUpdate(1.0, 3.0);
          assertEquals(1.0, series.getY(0));
          assertEquals(2.0, series.getY(1));
          assertEquals(3.0, series.getY(2));
          assertEquals(3, series.getItemCount());
      }
  
      /**
       * Some checks for the add() method for an UNSORTED series.
       */
      @Test
      public void testAdd() {
          XYSeries series = new XYSeries("Series", false, true);
          series.add(5.0, 5.50);
          series.add(5.1, 5.51);
          series.add(6.0, 6.6);
          series.add(3.0, 3.3);
          series.add(4.0, 4.4);
          series.add(2.0, 2.2);
          series.add(1.0, 1.1);
          assertEquals(5.5, series.getY(0).doubleValue(), EPSILON);
          assertEquals(5.51, series.getY(1).doubleValue(), EPSILON);
          assertEquals(6.6, series.getY(2).doubleValue(), EPSILON);
          assertEquals(3.3, series.getY(3).doubleValue(), EPSILON);
          assertEquals(4.4, series.getY(4).doubleValue(), EPSILON);
          assertEquals(2.2, series.getY(5).doubleValue(), EPSILON);
          assertEquals(1.1, series.getY(6).doubleValue(), EPSILON);
      }
  
      /**
       * A simple check that the maximumItemCount attribute is working.
       */
      @Test
      public void testSetMaximumItemCount() {
          XYSeries s1 = new XYSeries("S1");
          assertEquals(Integer.MAX_VALUE, s1.getMaximumItemCount());
          s1.setMaximumItemCount(2);
          assertEquals(2, s1.getMaximumItemCount());
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
          assertEquals(2.0, s1.getX(0).doubleValue(), EPSILON);
          assertEquals(3.0, s1.getX(1).doubleValue(), EPSILON);
      }
  
      /**
       * Check that the maximum item count can be applied retrospectively.
       */
      @Test
      public void testSetMaximumItemCount2() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
          s1.setMaximumItemCount(2);
          assertEquals(2.0, s1.getX(0).doubleValue(), EPSILON);
          assertEquals(3.0, s1.getX(1).doubleValue(), EPSILON);
      }
  
      /**
       * Check that the item bounds are determined correctly when there is a
       * maximum item count.
       */
      @Test
      public void testSetMaximumItemCount3() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
          s1.add(4.0, 4.4);
          s1.add(5.0, 5.5);
          s1.add(6.0, 6.6);
          s1.setMaximumItemCount(2);
          assertEquals(5.0, s1.getX(0).doubleValue(), EPSILON);
          assertEquals(6.0, s1.getX(1).doubleValue(), EPSILON);
          assertEquals(5.0, s1.getMinX(), EPSILON);
          assertEquals(6.0, s1.getMaxX(), EPSILON);
          assertEquals(5.5, s1.getMinY(), EPSILON);
          assertEquals(6.6, s1.getMaxY(), EPSILON);
      }
  
      /**
       * Check that the item bounds are determined correctly when there is a
       * maximum item count.
       */
      @Test
      public void testSetMaximumItemCount4() {
          XYSeries s1 = new XYSeries("S1");
          s1.setMaximumItemCount(2);
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
          assertEquals(2.0, s1.getX(0).doubleValue(), EPSILON);
          assertEquals(3.0, s1.getX(1).doubleValue(), EPSILON);
          assertEquals(2.0, s1.getMinX(), EPSILON);
          assertEquals(3.0, s1.getMaxX(), EPSILON);
          assertEquals(2.2, s1.getMinY(), EPSILON);
          assertEquals(3.3, s1.getMaxY(), EPSILON);
      }
  
      /**
       * Some checks for the toArray() method.
       */
      @Test
      public void testToArray() {
          XYSeries s = new XYSeries("S1");
          double[][] array = s.toArray();
          assertEquals(2, array.length);
          assertEquals(0, array[0].length);
          assertEquals(0, array[1].length);
  
          s.add(1.0, 2.0);
          array = s.toArray();
          assertEquals(1, array[0].length);
          assertEquals(1, array[1].length);
          assertEquals(2, array.length);
          assertEquals(1.0, array[0][0], EPSILON);
          assertEquals(2.0, array[1][0], EPSILON);
  
          s.add(2.0, null);
          array = s.toArray();
          assertEquals(2, array.length);
          assertEquals(2, array[0].length);
          assertEquals(2, array[1].length);
          assertEquals(2.0, array[0][1], EPSILON);
          assertTrue(Double.isNaN(array[1][1]));
      }
  
      /**
       * Some checks for an example using the toArray() method.
       */
      @Test
      public void testToArrayExample() {
          XYSeries s = new XYSeries("S");
          s.add(1.0, 11.0);
          s.add(2.0, 22.0);
          s.add(3.5, 35.0);
          s.add(5.0, null);
          DefaultXYDataset dataset = new DefaultXYDataset();
          dataset.addSeries("S", s.toArray());
          assertEquals(1, dataset.getSeriesCount());
          assertEquals(4, dataset.getItemCount(0));
          assertEquals("S", dataset.getSeriesKey(0));
          assertEquals(1.0, dataset.getXValue(0, 0), EPSILON);
          assertEquals(2.0, dataset.getXValue(0, 1), EPSILON);
          assertEquals(3.5, dataset.getXValue(0, 2), EPSILON);
          assertEquals(5.0, dataset.getXValue(0, 3), EPSILON);
          assertEquals(11.0, dataset.getYValue(0, 0), EPSILON);
          assertEquals(22.0, dataset.getYValue(0, 1), EPSILON);
          assertEquals(35.0, dataset.getYValue(0, 2), EPSILON);
          assertTrue(Double.isNaN(dataset.getYValue(0, 3)));
      }
  
      /**
       * Another test for the addOrUpdate() method.
       */
      @Test
      public void testBug1955483() {
          XYSeries series = new XYSeries("Series", true, true);
          series.addOrUpdate(1.0, 1.0);
          series.addOrUpdate(1.0, 2.0);
          assertEquals(1.0, series.getY(0));
          assertEquals(2.0, series.getY(1));
          assertEquals(2, series.getItemCount());
      }
  
      /**
       * Some checks for the delete(int, int) method.
       */
      @Test
      public void testDelete() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
          s1.add(4.0, 4.4);
          s1.add(5.0, 5.5);
          s1.add(6.0, 6.6);
          s1.delete(2, 5);
          assertEquals(2, s1.getItemCount());
          assertEquals(1.0, s1.getX(0).doubleValue(), EPSILON);
          assertEquals(2.0, s1.getX(1).doubleValue(), EPSILON);
          assertEquals(1.0, s1.getMinX(), EPSILON);
          assertEquals(2.0, s1.getMaxX(), EPSILON);
          assertEquals(1.1, s1.getMinY(), EPSILON);
          assertEquals(2.2, s1.getMaxY(), EPSILON);
      }
  
      /**
       * Some checks for the getMinX() method.
       */
      @Test
      public void testGetMinX() {
          XYSeries s1 = new XYSeries("S1");
          assertTrue(Double.isNaN(s1.getMinX()));
  
          s1.add(1.0, 1.1);
          assertEquals(1.0, s1.getMinX(), EPSILON);
  
          s1.add(2.0, 2.2);
          assertEquals(1.0, s1.getMinX(), EPSILON);
  
          s1.add(Double.NaN, 99.9);
          assertEquals(1.0, s1.getMinX(), EPSILON);
  
          s1.add(-1.0, -1.1);
          assertEquals(-1.0, s1.getMinX(), EPSILON);
  
          s1.add(0.0, null);
          assertEquals(-1.0, s1.getMinX(), EPSILON);
      }
  
      /**
       * Some checks for the getMaxX() method.
       */
      @Test
      public void testGetMaxX() {
          XYSeries s1 = new XYSeries("S1");
          assertTrue(Double.isNaN(s1.getMaxX()));
  
          s1.add(1.0, 1.1);
          assertEquals(1.0, s1.getMaxX(), EPSILON);
  
          s1.add(2.0, 2.2);
          assertEquals(2.0, s1.getMaxX(), EPSILON);
  
          s1.add(Double.NaN, 99.9);
          assertEquals(2.0, s1.getMaxX(), EPSILON);
  
          s1.add(-1.0, -1.1);
          assertEquals(2.0, s1.getMaxX(), EPSILON);
  
          s1.add(0.0, null);
          assertEquals(2.0, s1.getMaxX(), EPSILON);
      }
  
      /**
       * Some checks for the getMinY() method.
       */
      @Test
      public void testGetMinY() {
          XYSeries s1 = new XYSeries("S1");
          assertTrue(Double.isNaN(s1.getMinY()));
  
          s1.add(1.0, 1.1);
          assertEquals(1.1, s1.getMinY(), EPSILON);
  
          s1.add(2.0, 2.2);
          assertEquals(1.1, s1.getMinY(), EPSILON);
  
          s1.add(Double.NaN, 99.9);
          assertEquals(1.1, s1.getMinY(), EPSILON);
  
          s1.add(-1.0, -1.1);
          assertEquals(-1.1, s1.getMinY(), EPSILON);
  
          s1.add(0.0, null);
          assertEquals(-1.1, s1.getMinY(), EPSILON);
     }
  
      /**
       * Some checks for the getMaxY() method.
       */
      @Test
      public void testGetMaxY() {
          XYSeries s1 = new XYSeries("S1");
          assertTrue(Double.isNaN(s1.getMaxY()));
  
          s1.add(1.0, 1.1);
          assertEquals(1.1, s1.getMaxY(), EPSILON);
  
          s1.add(2.0, 2.2);
          assertEquals(2.2, s1.getMaxY(), EPSILON);
  
          s1.add(Double.NaN, 99.9);
          assertEquals(99.9, s1.getMaxY(), EPSILON);
  
          s1.add(-1.0, -1.1);
          assertEquals(99.9, s1.getMaxY(), EPSILON);
  
          s1.add(0.0, null);
          assertEquals(99.9, s1.getMaxY(), EPSILON);
      }
  
      /**
       * A test for a bug reported in the forum:
       * 
       * http://www.jfree.org/forum/viewtopic.php?f=3&t=116601
       */
      @Test
      public void testGetMaxY2() {
          XYSeries series = new XYSeries(1, true, false);
          series.addOrUpdate(1, 20);
          series.addOrUpdate(2, 30);
          series.addOrUpdate(3, 40);
          assertEquals(40.0, series.getMaxY(), EPSILON);
          series.addOrUpdate(2, 22);
          assertEquals(40.0, series.getMaxY(), EPSILON);        
      }
  
      /**
       * A test for the clear method.
       */
      @Test
      public void testClear() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
  
          assertEquals(3, s1.getItemCount());
  
          s1.clear();
          assertEquals(0, s1.getItemCount());
          assertTrue(Double.isNaN(s1.getMinX()));
          assertTrue(Double.isNaN(s1.getMaxX()));
          assertTrue(Double.isNaN(s1.getMinY()));
          assertTrue(Double.isNaN(s1.getMaxY()));
      }
  
      /**
       * Some checks for the updateByIndex() method.
       */
      @Test
      public void testUpdateByIndex() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
  
          assertEquals(1.1, s1.getMinY(), EPSILON);
          assertEquals(3.3, s1.getMaxY(), EPSILON);
  
          s1.updateByIndex(0, -5.0);
          assertEquals(-5.0, s1.getMinY(), EPSILON);
          assertEquals(3.3, s1.getMaxY(), EPSILON);
  
          s1.updateByIndex(0, null);
          assertEquals(2.2, s1.getMinY(), EPSILON);
          assertEquals(3.3, s1.getMaxY(), EPSILON);
  
          s1.updateByIndex(2, null);
          assertEquals(2.2, s1.getMinY(), EPSILON);
          assertEquals(2.2, s1.getMaxY(), EPSILON);
  
          s1.updateByIndex(1, null);
          assertTrue(Double.isNaN(s1.getMinY()));
          assertTrue(Double.isNaN(s1.getMaxY()));
      }
  
      /**
       * Some checks for the updateByIndex() method.
       */
      @Test
      public void testUpdateByIndex2() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, Double.NaN);
  
          assertTrue(Double.isNaN(s1.getMinY()));
          assertTrue(Double.isNaN(s1.getMaxY()));
  
          s1.updateByIndex(0, 1.0);
          assertEquals(1.0, s1.getMinY(), EPSILON);
          assertEquals(1.0, s1.getMaxY(), EPSILON);
  
          s1.updateByIndex(0, 2.0);
          assertEquals(2.0, s1.getMinY(), EPSILON);
          assertEquals(2.0, s1.getMaxY(), EPSILON);
  
          s1.add(-1.0, -1.0);
          s1.updateByIndex(0, 0.0);
          assertEquals(0.0, s1.getMinY(), EPSILON);
          assertEquals(2.0, s1.getMaxY(), EPSILON);
      }
  
      /**
       * Some checks for the updateByIndex() method.
       */
      @Test
      public void testUpdateByIndex3() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, 1.1);
          s1.add(2.0, 2.2);
          s1.add(3.0, 3.3);
  
          s1.updateByIndex(1, 2.05);
          assertEquals(1.1, s1.getMinY(), EPSILON);
          assertEquals(3.3, s1.getMaxY(), EPSILON);
      }
  
      /**
       * Some checks for the update(Number, Number) method.
       */
      @Test
      public void testUpdateXY() {
          XYSeries s1 = new XYSeries("S1");
          s1.add(1.0, Double.NaN);
  
          assertTrue(Double.isNaN(s1.getMinY()));
          assertTrue(Double.isNaN(s1.getMaxY()));
  
          s1.update(1.0, 1.0);
          assertEquals(1.0, s1.getMinY(), EPSILON);
          assertEquals(1.0, s1.getMaxY(), EPSILON);
  
          s1.update(1.0, 2.0);
          assertEquals(2.0, s1.getMinY(), EPSILON);
          assertEquals(2.0, s1.getMaxY(), EPSILON);
      }
  
      @Test
      public void testSetKey() {
          XYSeries s1 = new XYSeries("S");
          s1.setKey("S1");
          assertEquals("S1", s1.getKey());
          
          XYSeriesCollection c = new XYSeriesCollection();
          c.addSeries(s1);
          XYSeries s2 = new XYSeries("S2");
          c.addSeries(s2);
          
          // now we should be allowed to change s1's key to anything but "S2"
          s1.setKey("OK");
          assertEquals("OK", s1.getKey());
          
          try {
              s1.setKey("S2");
              fail("Expect an exception here.");
          } catch (IllegalArgumentException e) {
              // OK
          }
          
          // after s1 is removed from the collection, we should be able to set
          // the key to anything we want...
          c.removeSeries(s1);
          s1.setKey("S2");
          
          // check that removing by index also works
          s1.setKey("S1");
          c.addSeries(s1);
          c.removeSeries(1);
          s1.setKey("S2");
      }
  }
  